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Antigen challenge inhibits thymic emigration.

Adam P Uldrich¹, Stuart P Berzins, Mark A Malin

¹Department of Microbiology and Immunology, University of Melbourne, Parkville, Victoria, Australia. adam.uldrich@petermac.org

Journal of Immunology (Baltimore, Md. : 1950)

|April 6, 2006

Summary

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T-cell export from the thymus is regulated by T cell receptor (TCR) signaling. Antigen exposure inhibits T cell emigration, retaining thymocytes in the medulla and impacting recent thymic emigrants (RTE).

Area of Science:

Immunology
T cell biology
Thymic development

Background:

T cell development involves TCR-mediated selection in the thymus.
Thymic emigration, the final maturation step, is poorly understood.
The role of TCR signaling in regulating thymic export is unclear.

Purpose of the Study:

To investigate the influence of TCR signaling on thymic emigration.
To determine if antigen (Ag) exposure affects recent thymic emigrants (RTE).
To elucidate the mechanisms regulating T cell export from the thymus.

Main Methods:

Utilized wild-type and TCR transgenic mice.
Administered antigen (Ag) intravenously and intrathymically.
Analyzed RTE numbers in periphery and thymocyte populations.

Related Experiment Videos

Examined Bim-deficient mice to rule out peripheral deletion.

Main Results:

Antigen administration significantly reduced peripheral RTE numbers.
Reduced RTE numbers resulted from inhibited T cell export, not peripheral deletion.
Medullary thymocyte retention, not increased negative selection, correlated with RTE loss.
TCR-independent suppression of emigration was observed, partly mediated by TNF.

Conclusions:

TCR signaling plays a crucial role in regulating thymic emigration.
Antigen-specific and TCR-independent mechanisms control T cell export.
Thymic emigration is a regulated process influenced by immune signals.